This content is reviewed regularly and is updated when new and relevant evidence is made available. This information is neither intended nor implied to be a substitute for professional medical advice. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with questions regarding a medical condition.

United States Department of Agriculture and United States Department of Health and Human Services.
Dietary Guidelines for Americans, 2010
. 7th Edition, Washington, DC: United States Government Printing Office, December 2010.